JPS587636Y2 - Cotai Denkai Capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solid electrolytic capacitor comprising an anode made of a valve metal and a solid electrolyte, and specifically relates to a lead wire extraction structure of a solid electrolytic capacitor.

Conventionally, as shown in FIG. 3, the anode lead wire of a solid electrolytic capacitor that uses a resin wrapping method is electrically connected to the lead-in wire 2' of the anode body 1' by welding. A bent portion 3a' bent at a right angle on the lower side of the lead-in wire 2' was electrically connected to the lead-in wire 2' by welding.

However, in this case, since the connection point between the anode lead wire 3' and the introduction wire 2' was close to the anode body 1', the stress during welding had a negative effect on the solid electrolytic capacitor body, and the dielectric layer was damaged. When forming a semiconductor layer 4' such as manganese dioxide MnO2 on the surface of the formed anode body 1', Mn
Accidents have occurred in which O2 creeps up and reaches the connection point, causing a short circuit between the anode lead wire 3' and the cathode lead wire 5', resulting in an increase in leakage current.

The present invention solves the above-mentioned drawbacks of the conventional technology, and by providing the connection point between the anode lead wire and the lead-in wire protruding from the valve metal powder as high as possible, it is possible to prevent thread loss during welding. Mn
This is to prevent O2 from creeping up the lead-in wire and reaching the connection point between the anode lead wire and the lead-in wire, causing a short circuit between the anode body and the cathode layer.

In addition, by making the length of the anode lead wire buried in the resin as long as possible, the thickness of the resin near and above the connection point between the anode lead wire and the lead-in wire can be made thicker, and the anode can withstand tensile force from the outside. This increases the strength of the node line.

An embodiment of the present invention will be described below with reference to FIG.

In the figure, reference numeral 1 denotes an anode body constructed by embedding a part of the introduction wire 2 of the valve metal in a sintered body of valve metal powder such as tantalum or aluminum so as to protrude to the outside. A dielectric layer 3 is formed by a method such as anodic oxidation.

4 is a cathode layer made of carbon or the like formed on the surface of the dielectric layer 3 with a semiconductor layer 5 of manganese dioxide MnO2 or the like interposed therebetween;
A metal layer 6 made of silver paint or the like that can be soldered is formed on its surface.

7 is a cathode lead wire electrically connected to the metal layer 6 through a solder layer 8, 9 is an anode lead wire electrically connected to the lead-in wire 2 by welding or the like, and this anode lead wire 10 is connected to the solid electrolytic capacitor body. The part buried in the resin 10 is bent at an acute angle in order to lengthen the length H buried in the resin 9 for mounting the capacitor, and to separate the connection point with the lead-in wire 2 from the solid electrolytic capacitor body as much as possible. ing.

Note that the best effect can be obtained when the bending angle is an acute angle of 20 to 60 degrees.

Further, H is the length of the part of the anode lead wire 9 buried in the resin 10 as described above, and a is the distance between the connection point of the anode lead wire 9 and the lead-in wire 2 and the solid electrolytic capacitor body. .

In the above configuration, if the part of the anode lead wire 9 buried in the resin 10 is bent at an acute angle, the anode 9 and the introduction wire 2
Distance a between the connection point and the solid electrolytic capacitor body
When the anode lead wire 9 and lead-in wire 2 are electrically connected by welding, it is possible to eliminate the adverse effect on the solid electrolytic capacitor body due to stress during welding. When forming semiconductor layer 5 such as
Accidents such as an increase in leakage current caused by a short circuit between the two can also be prevented.

In addition, since the length H of the part of the anode lead wire 9 buried in the resin 10 can be increased, the thickness of the resin 10 near and above the connection point between the anode lead wire 9 and the lead-in wire 2 becomes thicker, and the outside It is possible to increase the strength of the anode lead wire 9 against the tensile force exerted by the anode lead wire 9.

FIG. 2 shows another embodiment of the present invention, in which when the anode lead wire 9 and the lead-in wire 2 are electrically connected by welding, the lead-in wire 2
The connection points are rolled in advance.

In this way, the welding work can be easily performed without the introduction wire 2 and the anode lead wire 9 coming into contact with each other.

Further, the anode lead wire 9 may be rolled. Furthermore, if both the anode lead wire 9 and the introduction wire 2 are rolled, the welding work will be made easier.

Since the present invention is constructed as described above, it is possible to eliminate the adverse effects of stress during welding on the main body of the capacitor, prevent an increase in short circuit leakage current, and further increase the strength of the lead wire. It has very excellent effects such as:

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the structure of a solid electrolytic capacitor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the structure of a solid electrolytic capacitor according to another embodiment of the present invention, and FIG. FIG. 2 is a cross-sectional view showing the structure of an electrolytic capacitor. 1...Anode body, 2...Introduction wire, 3...
...Dielectric layer, 4...Cathode layer, 5...
...Semiconductor layer, 7...Cathode lead wire, 9...
...Anode lead wire, 10...Resin.

Claims (1)

[Scope of utility model registration request] A cathode layer is formed on the surface of the anode body, which is constructed by embedding a part of the lead-in wire made of this metal in a sintered body of valve metal powder so as to protrude to the outside, through a dielectric layer and a semiconductor layer. A cathode lead wire is electrically connected to the cathode layer, an anode lead wire is connected to the lead-in wire, and the anode lead wire is bent at an acute angle to connect the cathode lead wire to the cathode layer. Connect electrically parallel to the lead wire,
A solid electrolytic capacitor is made by dipping them in resin.